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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76f9530dd6277fc2a944f7399617165dfa907ffee531ba186881aaee744a187c' 
  AND token = 'di/1GQgAl4UWSONvM0sNU7sqpY1xWy5z/AP9Je5WFJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}